SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2999f6609dcaa4048f7904d4e3e06b17073ca127873565cda678ddb4c59b57d4' 
  AND token = 'Se8YUc/9uhvHuDwDEm8+8CVGUUwHOJw4yLFpE7YC5YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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