Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e3edf1b79ee3881b55f2577d12c23486e72264d807e07bda77b5bed48bafcc' 
  AND token = 'Ec/QWxHGgy7qkL6PIcyiyzbC7cJ9GpSFevYrz6oWS7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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