Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacf3f87c13ccb2256ae86b76e0c79a71998a9036a629c6a714003fca4d93a81' 
  AND token = 'WayP405yDBY+MF1oCDj3Lka6oszmD9bOkM6EUNxtOw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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