SELECT 
  cscart_products_categories.category_id as variant_id, 
  ccd.category as variant 
FROM 
  cscart_products_categories 
  LEFT JOIN cscart_products as products ON products.product_id = cscart_products_categories.product_id 
  INNER JOIN cscart_categories as cc ON cscart_products_categories.category_id = cc.category_id 
  AND cc.company_id = 0 
  AND cc.status = 'A' 
  LEFT JOIN cscart_category_descriptions as ccd ON cscart_products_categories.category_id = ccd.category_id 
  AND ccd.lang_code = 'en' 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_supplier_links ON cscart_supplier_links.object_id = products.product_id 
  AND cscart_supplier_links.object_type = 'P' 
  LEFT JOIN cscart_master_products_storefront_offers_count AS master_products_storefront_offers_count ON master_products_storefront_offers_count.product_id = products.product_id 
  AND master_products_storefront_offers_count.storefront_id = 1 
  LEFT JOIN cscart_product_sales ON cscart_product_sales.product_id = products.product_id 
  AND cscart_product_sales.category_id = products_categories.category_id 
WHERE 
  1 = 1 
  AND ccd.category_id IN ('3018') 
  AND cscart_categories.category_id IN (3018) 
  AND (
    companies.status IN ('A') 
    OR products.company_id = 0
  ) 
  AND products.company_id IN (13, 0) 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND products.master_product_status IN ('A') 
  AND products.master_product_id = 0 
  AND (
    products.company_id > 0 
    OR master_products_storefront_offers_count.count > 0
  ) 
GROUP BY 
  cscart_products_categories.category_id 
ORDER BY 
  ccd.category ASC

Query time 0.00125

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "27.79"
    },
    "ordering_operation": {
      "using_filesort": false,
      "grouping_operation": {
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "master_products_storefront_offers_count",
              "access_type": "system",
              "possible_keys": [
                "PRIMARY",
                "idx_storefront_id"
              ],
              "rows_examined_per_scan": 0,
              "rows_produced_per_join": 1,
              "filtered": "0.00",
              "const_row_not_found": true,
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.10",
                "prefix_cost": "0.00",
                "data_read_per_join": "16"
              },
              "used_columns": [
                "storefront_id",
                "product_id",
                "count"
              ]
            }
          },
          {
            "table": {
              "table_name": "cc",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_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": "2K"
              },
              "used_columns": [
                "category_id",
                "company_id",
                "status"
              ]
            }
          },
          {
            "table": {
              "table_name": "ccd",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_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": "3K"
              },
              "used_columns": [
                "category_id",
                "lang_code",
                "category"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_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": "2K"
              },
              "used_columns": [
                "category_id",
                "usergroup_ids",
                "status",
                "storefront_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "link_type",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 84,
              "rows_produced_per_join": 84,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.28",
                "eval_cost": "8.40",
                "prefix_cost": "8.68",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ],
              "attached_condition": "(`cscart_db`.`cscart_products_categories`.`category_id` = '3018')"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id",
                "product_id"
              ],
              "key_length": "6",
              "ref": [
                "const",
                "cscart_db.cscart_products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 84,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "8.40",
                "prefix_cost": "17.08",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_master_product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "cscart_db.cscart_products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 4,
              "filtered": "5.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.42",
                "prefix_cost": "25.48",
                "data_read_per_join": "21K"
              },
              "used_columns": [
                "product_id",
                "status",
                "company_id",
                "usergroup_ids",
                "master_product_id",
                "master_product_status"
              ],
              "attached_condition": "((`cscart_db`.`products`.`master_product_id` = 0) and (`cscart_db`.`products`.`company_id` in (13,0)) and ((`cscart_db`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`cscart_db`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`cscart_db`.`products`.`usergroup_ids`))) and (`cscart_db`.`products`.`status` = 'A') and (`cscart_db`.`products`.`master_product_status` = 'A') and ((`cscart_db`.`products`.`company_id` > 0) or <cache>((NULL > 0))))"
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "cscart_db.products.company_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 4,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.42",
                "prefix_cost": "25.90",
                "data_read_per_join": "29K"
              },
              "used_columns": [
                "company_id",
                "status"
              ],
              "attached_condition": "<if>(found_match(companies), ((`cscart_db`.`companies`.`status` = 'A') or (`cscart_db`.`products`.`company_id` = 0)), true)"
            }
          },
          {
            "table": {
              "table_name": "cscart_supplier_links",
              "access_type": "ref",
              "possible_keys": [
                "object_id"
              ],
              "key": "object_id",
              "used_key_parts": [
                "object_id",
                "object_type"
              ],
              "key_length": "7",
              "ref": [
                "cscart_db.cscart_products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 4,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "1.05",
                "eval_cost": "0.42",
                "prefix_cost": "27.37",
                "data_read_per_join": "67"
              },
              "used_columns": [
                "object_id",
                "object_type"
              ],
              "attached_condition": "<if>(is_not_null_compl(cscart_supplier_links), (`cscart_db`.`cscart_supplier_links`.`object_id` = `cscart_db`.`cscart_products_categories`.`product_id`), true)"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_sales",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "pa"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id",
                "product_id"
              ],
              "key_length": "6",
              "ref": [
                "const",
                "cscart_db.cscart_products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 4,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.42",
                "prefix_cost": "27.79",
                "data_read_per_join": "67"
              },
              "used_columns": [
                "category_id",
                "product_id"
              ]
            }
          }
        ]
      }
    }
  }
}