Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8cf45828d60e7ff33a1e49133d4730b75ec93894531b8f0315798a4eef5e76' 
  AND token = 'N7e9Y8Eip2la/ydrIquJzTqqld0hHiE3zUKpbEbQVnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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