SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38113328f144ce4bffeaddf559629d31697b3df24ab456bc64a8e3b49f805d9f' 
  AND token = 'Ph6GnF6aqthJF7bySjnuyYmYCB/ZDWsyJbP1ywVQN+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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