Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ceaddcdda07d847f30b8122270832e57a549cd5f766e61b055118f86463074' 
  AND token = 'qG0UMEYsnsq0HdA8rYlzUNNLaOaFlCbEHqQQZH5GbDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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