SELECT 
  tmall_products.* 
FROM 
  tmall_products 
WHERE 
  tmall_products.product_id IN (
    70, 156, 175, 43, 76, 56, 57, 30, 246, 173, 
    67, 25, 154, 53, 52, 161, 165, 166
  )

Query time 0.24213

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 (70,156,175,43,76,56,57,30,246,173,67,25,154,53,52,161,165,166)"
        }
      }
    ]
  }
}