Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa39c0e81b289dbfb926ce39ef17f5ff0d3843a30198e43ef06ec4f50d75c84' 
  AND token = 'zM4izN2Ip2qL164KWbidarKSxuXdrhf3Uc93bbKyB24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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