Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eeb8e94bf040c19c81f3945a225f0096553f2508d8f7fbdcfc1fd0cb94a1fd1' 
  AND token = 'd+9SnLsnn3tleWgvRNoNfh37i82+bqtbiHg/Ui6GVgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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