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\Drupal\Core\Database\Database::setActiveConnection('external');

    // Get a connection going

    $db = \Drupal\Core\Database\Database::getConnection();

    $query = $db->select('node', 'n');

    $result = $query

              ->fields('n')

              ->condition('n.type', 'article')

              ->execute()

              ->fetchAll();

    $storage = \Drupal::entityTypeManager()->getStorage('node');

    $node = $storage->load($result[0]->nid);

    dump($node);

    // Switch back

    \Drupal\Core\Database\Database::setActiveConnection();

$node = $storage->load($result[0]->nid); // this load a node from default DB and not external DB so that's not good