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 (
    303, 304, 305, 328, 310, 311, 312, 313, 
    314, 315, 316, 317, 318, 319, 320, 321, 
    327, 291, 292, 307, 296, 297, 293, 294, 
    308, 302, 306, 309, 298, 299, 300, 301
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_review_prepared_data",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 52,
          "filtered": 61.53845978,
          "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (303,304,305,328,310,311,312,313,314,315,316,317,318,319,320,321,327,291,292,307,296,297,293,294,308,302,306,309,298,299,300,301)"
        }
      }
    ]
  }
}