Custom loop not working

Try this:

$args = array(
  'post_type'=> 'televisie',
  'post_status' => 'publish',
  'posts_per_page' => 5,
  'meta_key'     => 'layout_meta_box',
  'meta_value'   => 'synopsis',
);

A helpful article too:
https://css-tricks.com/snippets/wordpress/custom-loop-based-on-custom-fields/

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