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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 (
    328, 329, 330, 535, 333, 390, 280, 689, 
    281, 283, 641, 309, 691, 693, 559, 645, 
    703, 533, 511, 534, 517, 702, 704, 585
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00003

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 133,
      "filtered": 18.04511261,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (328,329,330,535,333,390,280,689,281,283,641,309,691,693,559,645,703,533,511,534,517,702,704,585)"
    }
  }
}

Result

product_id	average_rating	reviews_count
281	0.00	1