Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd176e33bf7ad6c9bc8301d004decc4b8277b2cdc971b0eb83ae13eec8b969f3b' 
  AND token = 'uDU5HFa/uZORaKhAjkxYaW6zYJFDNXBc9GHivqH9n/Q=' 
  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"
    }
  }
}