SELECT 
  tmall_products.* 
FROM 
  tmall_products 
WHERE 
  tmall_products.product_id IN (
    94, 96, 136, 90, 95, 89, 82, 84, 85, 88, 
    47, 138, 93, 87, 139, 83, 137, 248
  )

Query time 0.00929

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.03187741,
    "nested_loop": [
      {
        "table": {
          "table_name": "tmall_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 18,
          "cost": 0.03187741,
          "filtered": 100,
          "index_condition": "tmall_products.product_id in (94,96,136,90,95,89,82,84,85,88,47,138,93,87,139,83,137,248)"
        }
      }
    ]
  }
}