如何使用wordpress上的数据库中的数据执行IF / ELSE语句？

I am trying to get the below code to perform an if/else statement. I am trying to say look in the database table 're_terms' and if the 'term_id' is '15' display this code, otherwise display this code.

I realise what I have at the moment is saying $product_id is 15 so it always displays the first set of html.

I am performing this in wordpress.

<?php 
$product_id = $wpdb->get_var("SELECT term_id 
                              FROM re_terms 
                              WHERE name = 'contract'");
echo $product_id;

if ($product_id == '15'): ?>
      <div class="grid__medium-4 grid__columns grid__columns_mobile text-c 
buttons">
        <a href="<?php echo get_site_url(); ?>/stockists"><span 
class="button_light">Find a stockist!!!!</span></a>
        <a href="<?php echo get_site_url(); ?>/brochure"><span 
class="button_light">Request a brochure</span></a>
      </div>

<?php else: ?>

    <div class="grid__medium-4 grid__columns grid__columns_mobile text-c 
buttons">
         <a href="<?php echo get_site_url(); ?>/stockists"><span 
 class="button_light">Find a stockist</span></a>
         <a href="<?php echo get_site_url(); ?>/brochure"><span 
 class="button_light">Request a brochure</span></a>
    </div>

<?php endif ?>