woocommerce_cart_item_quantity.php

<?php
/**
 * Remove quantity input field in cart for specific products
 */
function prefix_cart_item_quantity( $product_quantity, $cart_item_key ){
    $cart_item = WC()->cart->cart_contents[ $cart_item_key ];
	$product_id = $cart_item['data']->get_id();
    if( in_array( $product_id, array( 467, 789 ) ) ){
        $product_quantity = $cart_item['quantity'];
    }
    return $product_quantity;
}
add_filter( 'woocommerce_cart_item_quantity', 'prefix_cart_item_quantity', 10, 2 );