SELECT 
  cscart_products.*, 
  cscart_product_descriptions.*, 
  COALESCE(
    cscart_master_products_storefront_min_price.price, 
    MIN(
      IF(
        cscart_product_prices.percentage_discount = 0, 
        cscart_product_prices.price, 
        cscart_product_prices.price - (
          cscart_product_prices.price * cscart_product_prices.percentage_discount
        )/ 100
      )
    )
  ) as price, 
  GROUP_CONCAT(
    CASE WHEN (
      cscart_products_categories.link_type = 'M'
    ) THEN CONCAT(
      cscart_products_categories.category_id, 
      'M'
    ) ELSE cscart_products_categories.category_id END 
    ORDER BY 
      cscart_categories.storefront_id IN (0, 1) DESC, 
      (
        cscart_products_categories.link_type = 'M'
      ) DESC, 
      cscart_products_categories.category_position ASC, 
      cscart_products_categories.category_id ASC
  ) as category_ids, 
  popularity.total as popularity, 
  companies.company as company_name, 
  cscart_products.master_product_id, 
  cscart_products.master_product_status, 
  cscart_products.is_returnable, 
  cscart_products.return_period, 
  cscart_product_sales.amount as sales_amount, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path, 
  MIN(point_prices.point_price) as point_price, 
  cscart_product_points_and_cash.percentage_of_total_points as percentage_of_total_points, 
  cscart_discussion.type as discussion_type, 
  cscart_product_review_prepared_data.average_rating average_rating, 
  cscart_product_review_prepared_data.reviews_count product_reviews_count, 
  cscart_kl_product_margin.base_margin AS base_margin, 
  cscart_kl_product_margin.id AS margin_id, 
  cscart_kl_product_margin.recurring_margin AS recurring_margin, 
  DATE_FORMAT(
    FROM_UNIXTIME(
      cscart_kl_product_margin.effective_timestamp
    ), 
    "%Y-%m-%d"
  ) AS effective_timestamp 
FROM 
  cscart_products 
  LEFT JOIN cscart_product_prices ON cscart_product_prices.product_id = cscart_products.product_id 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0) 
  LEFT JOIN cscart_product_descriptions ON cscart_product_descriptions.product_id = cscart_products.product_id 
  AND cscart_product_descriptions.lang_code = 'en' 
  LEFT JOIN cscart_companies as companies ON companies.company_id = cscart_products.company_id 
  INNER JOIN cscart_products_categories ON cscart_products_categories.product_id = cscart_products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_products.status IN ('A', 'H') 
  LEFT JOIN cscart_product_popularity as popularity ON popularity.product_id = cscart_products.product_id 
  LEFT JOIN cscart_master_products_storefront_min_price ON cscart_master_products_storefront_min_price.product_id = cscart_products.product_id 
  AND cscart_master_products_storefront_min_price.storefront_id = 1 
  LEFT JOIN cscart_product_sales ON cscart_product_sales.product_id = cscart_products.product_id 
  AND cscart_product_sales.category_id = 2719 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = 8042 
  AND cscart_seo_names.type = 'p' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
  LEFT JOIN cscart_product_point_prices as point_prices ON point_prices.product_id = cscart_products.product_id 
  AND point_prices.lower_limit = 1 
  AND point_prices.usergroup_id IN (0, 0, 1) 
  LEFT JOIN cscart_product_points_and_cash ON cscart_product_points_and_cash.product_id = cscart_products.product_id 
  LEFT JOIN cscart_discussion ON cscart_discussion.object_id = cscart_products.product_id 
  AND cscart_discussion.object_type = 'P' 
  LEFT JOIN cscart_product_review_prepared_data ON cscart_product_review_prepared_data.product_id = cscart_products.product_id 
  AND cscart_product_review_prepared_data.storefront_id = 0 
  LEFT JOIN cscart_kl_product_margin ON cscart_kl_product_margin.product_id = cscart_products.product_id 
WHERE 
  cscart_products.product_id = 8042 
  AND (
    companies.status IN ('A') 
    OR cscart_products.company_id = 0
  ) 
GROUP BY 
  cscart_products.product_id

Query time 0.00221

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "174.81"
    },
    "grouping_operation": {
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_master_products_storefront_min_price",
            "access_type": "system",
            "possible_keys": [
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            "rows_examined_per_scan": 0,
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            "used_columns": [
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          }
        },
        {
          "table": {
            "table_name": "cscart_products",
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            "possible_keys": [
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              "idx_products_inventory",
              "idx_products_status_company_master",
              "idx_products_main_query",
              "idx_products_composite_query"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
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            ],
            "key_length": "3",
            "ref": [
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            ],
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            },
            "used_columns": [
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              "kl_erp_inventory_id",
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              "hsn_code",
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              "list_price",
              "amount",
              "kl_enable_qc",
              "kl_qc_amount",
              "weight",
              "length",
              "width",
              "height",
              "shipping_freight",
              "low_avail_limit",
              "timestamp",
              "updated_timestamp",
              "usergroup_ids",
              "is_edp",
              "edp_shipping",
              "unlimited_download",
              "tracking",
              "free_shipping",
              "zero_price_action",
              "is_pbp",
              "is_op",
              "is_oper",
              "is_returnable",
              "return_period",
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              "list_qty_count",
              "tax_ids",
              "age_verification",
              "age_limit",
              "options_type",
              "exceptions_type",
              "details_layout",
              "shipping_params",
              "facebook_obj_type",
              "parent_product_id",
              "buy_now_url",
              "is_stock_split_by_warehouses",
              "master_product_id",
              "master_product_status",
              "master_product_offers_count",
              "youtube_link",
              "show_youtube_video",
              "replace_main_image",
              "position_youtube",
              "restrict_cod",
              "seo_content"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_prices",
            "access_type": "const",
            "possible_keys": [
              "usergroup",
              "product_id",
              "lower_limit",
              "usergroup_id",
              "idx_product_prices_usergroup_limit",
              "idx_prices_discount_lookup",
              "idx_prices_min_calc",
              "idx_prices_usergroup_lookup",
              "idx_prices_usergroup_product"
            ],
            "key": "usergroup",
            "used_key_parts": [
              "product_id",
              "usergroup_id",
              "lower_limit"
            ],
            "key_length": "9",
            "ref": [
              "const",
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            ],
            "rows_examined_per_scan": 1,
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            "used_columns": [
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              "price",
              "percentage_discount",
              "lower_limit",
              "usergroup_id"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_descriptions",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY",
              "product_id",
              "idx_product_desc_lang",
              "idx_product_name_search",
              "idx_product_desc_sort"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "product_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
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            ],
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              "data_read_per_join": "4K"
            },
            "used_columns": [
              "product_id",
              "lang_code",
              "product",
              "shortname",
              "short_description",
              "full_description",
              "meta_keywords",
              "meta_description",
              "search_words",
              "page_title",
              "age_warning_message",
              "promo_text",
              "how_to_use",
              "key_product_info",
              "auto_update_inventory"
            ]
          }
        },
        {
          "table": {
            "table_name": "companies",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "company_id"
            ],
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            },
            "used_columns": [
              "company_id",
              "status",
              "company"
            ]
          }
        },
        {
          "table": {
            "table_name": "popularity",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY",
              "total"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "product_id"
            ],
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            },
            "used_columns": [
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            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_sales",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY",
              "pa",
              "idx_product_sales_category_amount"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id",
              "product_id"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "const"
            ],
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              "product_id",
              "amount"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_products_categories",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "pt",
              "idx_product_category_lookup",
              "idx_products_categories_composite"
            ],
            "key": "pt",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "ref": [
              "const"
            ],
            "rows_examined_per_scan": 2,
            "rows_produced_per_join": 2,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.65",
              "eval_cost": "0.20",
              "prefix_cost": "1.85",
              "data_read_per_join": "32"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type",
              "category_position"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "p_category_id",
              "idx_categories_storefront_status",
              "idx_categories_usergroup_status",
              "idx_categories_status_id_path"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id"
            ],
            "key_length": "3",
            "ref": [
              "cscart_db.cscart_products_categories.category_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "81.96",
            "cost_info": {
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              "eval_cost": "0.16",
              "prefix_cost": "2.05",
              "data_read_per_join": "4K"
            },
            "used_columns": [
              "category_id",
              "status",
              "storefront_id"
            ],
            "attached_condition": "((`cscart_db`.`cscart_categories`.`storefront_id` in (0,1)) and (`cscart_db`.`cscart_categories`.`status` in ('A','H')))"
          }
        },
        {
          "table": {
            "table_name": "cscart_seo_names",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "dispatch"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "type",
              "dispatch",
              "lang_code"
            ],
            "key_length": "206",
            "ref": [
              "const",
              "const",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
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              "read_cost": "0.41",
              "eval_cost": "0.16",
              "prefix_cost": "2.63",
              "data_read_per_join": "2K"
            },
            "used_columns": [
              "name",
              "object_id",
              "type",
              "dispatch",
              "path",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "point_prices",
            "access_type": "range",
            "possible_keys": [
              "unique_key",
              "src_k"
            ],
            "key": "unique_key",
            "used_key_parts": [
              "lower_limit",
              "usergroup_id",
              "product_id"
            ],
            "key_length": "8",
            "rows_examined_per_scan": 2,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "index_condition": "<if>(is_not_null_compl(point_prices), ((`cscart_db`.`point_prices`.`lower_limit` = 1) and (`cscart_db`.`point_prices`.`product_id` = 8042) and (`cscart_db`.`point_prices`.`usergroup_id` in (0,0,1))), true)",
            "using_join_buffer": "hash join",
            "cost_info": {
              "read_cost": "5.39",
              "eval_cost": "0.33",
              "prefix_cost": "8.34",
              "data_read_per_join": "78"
            },
            "used_columns": [
              "product_id",
              "point_price",
              "lower_limit",
              "usergroup_id"
            ],
            "attached_condition": "<if>(found_match(point_prices), true, true)"
          }
        },
        {
          "table": {
            "table_name": "cscart_product_points_and_cash",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "ref": [
              "const"
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              "prefix_cost": "8.67",
              "data_read_per_join": "52"
            },
            "used_columns": [
              "product_id",
              "percentage_of_total_points"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_discussion",
            "access_type": "const",
            "possible_keys": [
              "object_id"
            ],
            "key": "object_id",
            "used_key_parts": [
              "object_id",
              "object_type"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.00",
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              "prefix_cost": "9.00",
              "data_read_per_join": "78"
            },
            "used_columns": [
              "object_id",
              "object_type",
              "type"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_review_prepared_data",
            "access_type": "const",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "product_id",
              "storefront_id"
            ],
            "key_length": "7",
            "ref": [
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.00",
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              "prefix_cost": "9.32",
              "data_read_per_join": "52"
            },
            "used_columns": [
              "product_id",
              "storefront_id",
              "average_rating",
              "reviews_count"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_kl_product_margin",
            "access_type": "ref",
            "possible_keys": [
              "brand_id_composite",
              "product_id"
            ],
            "key": "brand_id_composite",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "ref": [
              "const"
            ],
            "rows_examined_per_scan": 50,
            "rows_produced_per_join": 163,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "149.10",
              "eval_cost": "16.39",
              "prefix_cost": "174.81",
              "data_read_per_join": "52K"
            },
            "used_columns": [
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              "product_id",
              "base_margin",
              "recurring_margin",
              "effective_timestamp"
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          }
        }
      ]
    }
  }
}