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 (
    16346, 16334, 16348, 15749, 14660, 14149, 
    16347, 14140, 14656, 14654, 14661, 
    15751, 16338, 15753, 14136, 16340, 
    15747, 16351, 15750, 14652, 14145, 
    14658, 14147, 15746
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0175378,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_review_prepared_data",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "loops": 1,
          "rows": 41,
          "cost": 0.0175378,
          "filtered": 58.53658676,
          "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (16346,16334,16348,15749,14660,14149,16347,14140,14656,14654,14661,15751,16338,15753,14136,16340,15747,16351,15750,14652,14145,14658,14147,15746)"
        }
      }
    ]
  }
}