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 (
    242, 243, 6, 66, 166, 214, 219, 221, 223, 
    240, 241, 244, 245, 246, 248, 247, 278, 
    280, 282, 285, 286, 287, 288, 289, 290
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00031

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": 48.07692337,
          "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (242,243,6,66,166,214,219,221,223,240,241,244,245,246,248,247,278,280,282,285,286,287,288,289,290)"
        }
      }
    ]
  }
}