SELECT 
  cscart_product_review_prepared_data.product_id AS product_id, 
  cscart_product_review_prepared_data.average_rating AS average_rating, 
  cscart_product_review_prepared_data.reviews_count AS reviews_count 
FROM 
  cscart_product_review_prepared_data 
WHERE 
  cscart_product_review_prepared_data.product_id IN (
    263981, 264102, 366828, 371861, 366833, 
    366771, 371878, 366815, 371873, 366690, 
    371884, 371890, 371868, 366760, 371898, 
    371895, 366821, 371902
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "5.87"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 19,
      "rows_produced_per_join": 18,
      "filtered": "94.74",
      "cost_info": {
        "read_cost": "2.27",
        "eval_cost": "3.60",
        "prefix_cost": "5.87",
        "data_read_per_join": "288"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`webmarco`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`webmarco`.`cscart_product_review_prepared_data`.`product_id` in (263981,264102,366828,371861,366833,366771,371878,366815,371873,366690,371884,371890,371868,366760,371898,371895,366821,371902)))"
    }
  }
}