Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4f2bc0f50b569c777a3800762f134e17ea490d9f65892a0401aaf776adce53' 
  AND token = '5YXqOPIe4BCgaNGc9m8e9+ZlOiB/+5pQIKgKs5cQZQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}