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contest-archistart

// WP_Query arguments
$args = array (
	'post_type'              => array( 'contest' ),
	'post_status'            => array( 'published' ),
	'order'                  => 'DESC',
	'orderby'                => 'id',
	'meta_query'             => array(
		array(
			'key'       => 'in_corso',
			'value'     => '1',
			'compare'   => '=',
		),
	),
);

// The Query
$terms = new WP_Query( $args );

// The Loop
if ( $terms->have_posts() ) {
	while ( $terms->have_posts() ) {
		$terms->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();