Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3b042b90d4a710ea99dbcf61d881ba2863d9e49c8e77957e79a04a66cf79fc' 
  AND token = 'L4flTHsqPdKAxOhf8UNmOAQMVJIvGDdrz0cLTtasoWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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