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 (
    256, 253, 254, 425, 251, 252, 426, 599, 
    600, 601, 257, 258, 525, 255, 526, 602, 
    603, 604, 261, 262, 259, 260, 403, 404, 
    265, 266, 263, 264, 405, 406, 267, 268
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 133,
      "filtered": 24.06015015,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (256,253,254,425,251,252,426,599,600,601,257,258,525,255,526,602,603,604,261,262,259,260,403,404,265,266,263,264,405,406,267,268)"
    }
  }
}

Result

product_id average_rating reviews_count
251 0.00 2
259 0.00 3
260 0.00 3
263 0.00 2
264 0.00 2
254 0.00 2
266 0.00 1
265 0.00 1
255 0.00 1
256 2.50 2
252 0.00 2
257 5.00 1
253 0.00 1
425 0.00 1
426 0.00 2
526 2.50 2