Get query result according to merged array

Use orderby post__in

$loop = new WP_Query(
    array(
        'post_type'      => 'product',
        'post__in'       => $posts, 
        'paged'          => $paged,
        'posts_per_page' => 5,
        'orderby'        => 'post__in'
    )
);

Remember it is only available from version 3.5

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