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 (
    255961, 255970, 260992, 261904, 285179, 
    285196, 295915, 315813, 141322, 163581, 
    183619, 210845, 223011, 225199, 236271, 
    238472, 253367, 285186, 285188, 295887, 
    308293, 308343, 308345, 317513
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "0.80"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 3,
      "rows_produced_per_join": 3,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.50",
        "eval_cost": "0.30",
        "prefix_cost": "0.80",
        "data_read_per_join": "48"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`unicomps`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`unicomps`.`cscart_product_review_prepared_data`.`product_id` in (255961,255970,260992,261904,285179,285196,295915,315813,141322,163581,183619,210845,223011,225199,236271,238472,253367,285186,285188,295887,308293,308343,308345,317513)))"
    }
  }
}