SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1606, 1612, 1617, 1619, 1634, 1647, 1651, 
    1659, 1667, 1733, 1735, 1894
  )

Query time 0.00079

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,
      "index_condition": "cscart_products.product_id in (1606,1612,1617,1619,1634,1647,1651,1659,1667,1733,1735,1894)"
    }
  }
}