SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd92fe228df88eb00db8be9da6ac1563106da5316a375422f9c5fdc973b7960' 
  AND token = 'AJ6UtizAvNtfMTgMvtmSzH/+kDjdZ2qF5tgKsIAw/mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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