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 (
    238400, 238518, 258627, 279059, 322596, 
    10101, 141331, 182500, 183418, 210394, 
    216091, 216439, 244556, 285152, 304053, 
    311249, 326960, 154729, 163659, 183540, 
    200612, 255788, 255803, 274116
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00028

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 (238400,238518,258627,279059,322596,10101,141331,182500,183418,210394,216091,216439,244556,285152,304053,311249,326960,154729,163659,183540,200612,255788,255803,274116)))"
    }
  }
}