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 (
    136, 90, 95, 89, 82, 84, 85, 88, 47, 138, 
    93, 87, 139, 83, 137, 94, 248
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0149298,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_review_prepared_data",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "loops": 1,
          "rows": 25,
          "cost": 0.0149298,
          "filtered": 68,
          "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (136,90,95,89,82,84,85,88,47,138,93,87,139,83,137,94,248)"
        }
      }
    ]
  }
}