SELECT 
  cscart_products.product_id, 
  cscart_products.product_code, 
  cscart_products.status, 
  cscart_products.company_id, 
  cscart_products.list_price, 
  cscart_products.shipping_params, 
  cscart_product_review_prepared_data.average_rating, 
  cscart_product_descriptions.product, 
  cscart_product_descriptions.short_description, 
  cscart_product_descriptions.full_description, 
  cscart_product_descriptions.promo_text, 
  IFNULL(
    avg(opr.rating_value), 
    3
  ) as actual_rating, 
  cd.category, 
  cd.category_id, 
  cc.category_id as main_category, 
  pvd.variant_id, 
  pvd.variant, 
  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 
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 
  LEFT JOIN cscart_product_review_prepared_data ON cscart_product_review_prepared_data.product_id = cscart_products.product_id 
  left join cscart_product_reviews opr on opr.product_id = cscart_products.product_id 
  and opr.status = "A" 
  left join cscart_product_features_values pfv on pfv.product_id = cscart_products.product_id 
  AND pfv.feature_id = 62 
  left join cscart_product_feature_variant_descriptions pvd on pvd.variant_id = pfv.variant_id 
  inner join cscart_products_categories pc on pc.product_id = cscart_products.product_id 
  inner join cscart_categories cc on cc.category_id = pc.category_id 
  and pc.link_type = "M" 
  inner join cscart_category_descriptions cd on cd.category_id = cc.parent_id 
  AND cscart_product_descriptions.lang_code = 'en' 
WHERE 
  cscart_products.product_id = 36685

Query time 0.00095

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "3.74"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "const",
          "possible_keys": [
            "PRIMARY",
            "idx_products_inventory"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "5K"
          },
          "used_columns": [
            "product_id",
            "product_code",
            "status",
            "company_id",
            "list_price",
            "shipping_params"
          ]
        }
      },
      {
        "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",
            "const",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "24"
          },
          "used_columns": [
            "product_id",
            "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": [
            "const",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "product_id",
            "lang_code",
            "product",
            "short_description",
            "full_description",
            "promo_text"
          ]
        }
      },
      {
        "table": {
          "table_name": "cscart_product_review_prepared_data",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.36",
            "eval_cost": "0.10",
            "prefix_cost": "0.46",
            "data_read_per_join": "16"
          },
          "used_columns": [
            "product_id",
            "average_rating"
          ]
        }
      },
      {
        "table": {
          "table_name": "opr",
          "access_type": "ref",
          "possible_keys": [
            "idx_product_id",
            "idx_product_reviews_status"
          ],
          "key": "idx_product_id",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.67",
            "eval_cost": "0.10",
            "prefix_cost": "1.23",
            "data_read_per_join": "1K"
          },
          "used_columns": [
            "product_id",
            "rating_value",
            "status"
          ],
          "attached_condition": "<if>(is_not_null_compl(opr), (`cscart_db`.`opr`.`status` = 'A'), true)"
        }
      },
      {
        "table": {
          "table_name": "pfv",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id",
            "fl"
          ],
          "key": "idx_product_feature_variant_id",
          "used_key_parts": [
            "product_id",
            "feature_id"
          ],
          "key_length": "6",
          "ref": [
            "const",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "0.59",
            "eval_cost": "0.10",
            "prefix_cost": "1.93",
            "data_read_per_join": "40"
          },
          "used_columns": [
            "feature_id",
            "product_id",
            "variant_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "pc",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "link_type",
            "pt",
            "idx_product_category_lookup",
            "idx_products_categories_composite"
          ],
          "key": "idx_products_categories_composite",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 2,
          "rows_produced_per_join": 1,
          "filtered": "50.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "0.41",
            "eval_cost": "0.10",
            "prefix_cost": "2.54",
            "data_read_per_join": "16"
          },
          "used_columns": [
            "product_id",
            "category_id",
            "link_type"
          ],
          "attached_condition": "(`cscart_db`.`pc`.`link_type` = 'M')"
        }
      },
      {
        "table": {
          "table_name": "cc",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY",
            "parent",
            "p_category_id",
            "idx_categories_parent_status"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "category_id"
          ],
          "key_length": "3",
          "ref": [
            "cscart_db.pc.category_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "2.89",
            "data_read_per_join": "2K"
          },
          "used_columns": [
            "category_id",
            "parent_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "cd",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "category_id"
          ],
          "key_length": "3",
          "ref": [
            "cscart_db.cc.parent_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "3.24",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "category_id",
            "category"
          ]
        }
      },
      {
        "table": {
          "table_name": "pvd",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id"
          ],
          "key_length": "3",
          "ref": [
            "cscart_db.pfv.variant_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.40",
            "eval_cost": "0.11",
            "prefix_cost": "3.75",
            "data_read_per_join": "7K"
          },
          "used_columns": [
            "variant_id",
            "variant"
          ]
        }
      }
    ]
  }
}

Result

product_id product_code status company_id list_price shipping_params average_rating product short_description full_description promo_text actual_rating category category_id main_category variant_id variant price
36685 8803348031086~old D 43 1919.00 a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:0;s:10:"box_length";i:0;s:9:"box_width";i:0;s:10:"box_height";i:0;} Green Grape Pore Control Toner <p>Frudia's Green Grape Pore Control Toner is fortified with 89% of antioxidant tannin-rich green grapes instead of water to exfoliate impurities and clarify pores without drying the skin, leaving your skin visibly balanced. The toner helps control excess sebum and hence minimizes the appearance of pores, which in turn makes for visibly smoother, clearer, and brighter skin. <br />Clinically tested for sensitive skin to deliver maximum hydration benefits without the imitation.<br />Frudia known for bringing beauty through fruits harnesses cold pressed juice liposome technology to extract the best beneficial nutrients from the fruits.</p> <ul><li>Use<strong> KLOVE</strong> & Get flat 5% off orders above Rs. 999.</li><li>Use<strong> GLOW10</strong> & Get Flat 10% off on orders above Rs. 1799.</li></ul> 3.0000 Toners 2710 2805 53920 Frudia 1343.300000