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remove_action( 'woocommerce_before_shop_loop_item', 'woocommerce_template_loop_product_link_open', 10);
add_action( 'woocommerce_before_shop_loop_item', 'my_loop_open', 10);
function my_loop_open() {
  $cart_link = 'http://adat.bis.rs/shop/cart/?add-to-cart='.get_the_ID();
  echo '<a href="' . $cart_link . '" class="woocommerce-LoopProduct-link">';
}