SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69474111ffb7b9b56e981ca8b89dec59aea624ef5cb37fa3ca31b9054af436a6' 
  AND token = 'W/f3nIGSlZT/t2YmINXE/vyVGgqwZdygAJcD8KHjWXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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