SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    18508, 18509, 18510, 18511, 18513, 18514, 
    18515, 18516, 18517, 18518, 18519, 
    18520, 18521, 18522, 18523, 18524, 
    18525, 18526, 18527, 18528, 18529, 
    18530, 18531, 18532, 18533, 18534
  )

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.04599966,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 26,
          "cost": 0.04599966,
          "filtered": 100,
          "attached_condition": "cscart_products.product_id in (18508,18509,18510,18511,18513,18514,18515,18516,18517,18518,18519,18520,18521,18522,18523,18524,18525,18526,18527,18528,18529,18530,18531,18532,18533,18534)"
        }
      }
    ]
  }
}