Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc7edc3d6f282eecbc4fa1d3f4a3cb29dde6d737cba3c3a2074db44460a603f' 
  AND token = 'qLKFcR3rq6lfanFjrr6WkMjSVaUIwKNEN8jgX/Gm9iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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