SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    64904, 64899, 64975, 65684, 65499, 65498, 
    65104, 64870, 64858, 65497, 65547, 
    65495
  )

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (64904,64899,64975,65684,65499,65498,65104,64870,64858,65497,65547,65495)"
    }
  }
}

Result