SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65, 64, 62, 30, 29, 37, 53, 52, 33, 32, 49, 
    59, 58, 60, 42, 39, 40, 43, 56, 57, 55, 
    50, 51, 48, 54, 63, 66
  )

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 27,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (65,64,62,30,29,37,53,52,33,32,49,59,58,60,42,39,40,43,56,57,55,50,51,48,54,63,66)"
        }
      }
    ]
  }
}