SELECT 
  COUNT(*) 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  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 
  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 prices.usergroup_id IN (0, 0, 1) 
  AND products.parent_product_id = 0 
  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
  )

Query time 0.00120

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.28"
    },
    "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": "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": "products_categories",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "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"
          ]
        }
      },
      {
        "table": {
          "table_name": "products",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY",
            "status",
            "idx_parent_product_id",
            "idx_master_product_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "cscart_db.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": "17.08",
            "data_read_per_join": "21K"
          },
          "used_columns": [
            "product_id",
            "status",
            "company_id",
            "usergroup_ids",
            "parent_product_id",
            "master_product_id",
            "master_product_status"
          ],
          "attached_condition": "((`cscart_db`.`products`.`master_product_id` = 0) and (`cscart_db`.`products`.`parent_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": "17.50",
            "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": "descr1",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY",
            "product_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id",
            "lang_code"
          ],
          "key_length": "9",
          "ref": [
            "cscart_db.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": "0.00",
            "eval_cost": "0.42",
            "prefix_cost": "17.92",
            "data_read_per_join": "19K"
          },
          "used_columns": [
            "product_id",
            "lang_code"
          ]
        }
      },
      {
        "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.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": "19.39",
            "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`.`products_categories`.`product_id`), true)"
        }
      },
      {
        "table": {
          "table_name": "prices",
          "access_type": "ref",
          "possible_keys": [
            "usergroup",
            "product_id",
            "lower_limit",
            "usergroup_id",
            "idx_product_prices_usergroup_limit"
          ],
          "key": "product_id",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "cscart_db.products_categories.product_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 4,
          "filtered": "99.94",
          "cost_info": {
            "read_cost": "1.05",
            "eval_cost": "0.42",
            "prefix_cost": "20.86",
            "data_read_per_join": "100"
          },
          "used_columns": [
            "product_id",
            "lower_limit",
            "usergroup_id"
          ],
          "attached_condition": "((`cscart_db`.`prices`.`lower_limit` = 1) and (`cscart_db`.`prices`.`usergroup_id` in (0,0,1)))"
        }
      },
      {
        "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.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": "21.28",
            "data_read_per_join": "67"
          },
          "used_columns": [
            "category_id",
            "product_id"
          ]
        }
      }
    ]
  }
}