Sandbox

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 (
    239, 242, 243, 241, 240, 214, 217, 218, 
    207, 59, 58, 60, 172, 134, 135, 168
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 52,
      "filtered": 30.76922989,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (239,242,243,241,240,214,217,218,207,59,58,60,172,134,135,168)"
    }
  }
}

Result

product_id	average_rating	reviews_count
242	3.50	2
172	4.00	1
239	3.00	1
241	5.00	3