Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23ce14359a0de85e568f821ff6f108a214a59f84bd35d7dbc3c4e73b80c758b' 
  AND token = 'GZ9fyTF6EdseaLpYMQhbzgTEwkgHCltUw/x9Zs7UaQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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