Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc349e61ae2c935be423ccf4908bebbd049d2c400ae26fc964eb6ab1d401c35' 
  AND token = 'KgLCAfzvB/Dj7s/VN/itTbcFSk0y6ggo6GnbZXMpUFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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