Improving Login Logic - JDBC - JavaWeb

I'm developing the login method of an application, but I've been noticing that the query I'm running to check if a user is registered to the system and if his password hits the bank's data is very slow. I'm using Select * FROM cadastrados , which ends up checking the whole database leaving the application "slow".

Can someone suggest me a query better for the login method or a better logic than the one I'm using? Below is the code:

//Login Usuário
public static Usuario Login(String login, String senha){
    Connection conn = Banco.getConexao();
    Usuario user = new Usuario();
    Statement stmt = null;
    ResultSet rs = null;
    String sql = "Select * FROM cadastrados";

    try{
        stmt = conn.createStatement();
        rs = stmt.executeQuery(sql);

        while(rs.next()){
            //Lógica do Login
            if(rs.getString(2).equals(login) && rs.getString(3).equals(senha)){
                user.setCpf(rs.getString(1));
                user.setLogin(rs.getString(2));
                user.setSenha(rs.getString(3));
                user.setNome(rs.getString(4));
                user.setSobrenome(rs.getString(5));
                user.setEndereco(rs.getString(6));
                user.setEmail(rs.getString(7));
                user.setLogado(true);
                break;
            }
        }
    }
    catch(SQLException ex){
        Logger.getLogger(UsuarioDAO.class.getName()).log(Level.SEVERE, null, ex);
    }
    finally{
        Banco.closeConexao(conn, rs, null, stmt);
    }
    return user;
}