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 (
    399, 398, 376, 375, 374, 373, 372, 371, 
    369, 358, 357, 356, 355, 354, 353, 352, 
    351, 350, 349, 332, 303, 302, 301, 300, 
    299, 298, 297, 296
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.61"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 11,
      "rows_produced_per_join": 11,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.51",
        "eval_cost": "1.10",
        "prefix_cost": "1.61",
        "data_read_per_join": "176"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`wearethehelpful_scalesta_net`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`wearethehelpful_scalesta_net`.`cscart_product_review_prepared_data`.`product_id` in (399,398,376,375,374,373,372,371,369,358,357,356,355,354,353,352,351,350,349,332,303,302,301,300,299,298,297,296)))"
    }
  }
}