create new file:

/wp-content/themes/yourtheme-child/master-slider.read.php
<?php
require_once '../../../wp-config.php';

/* get properties of specific master-slider slider
 *
 * js to decode params:
 * var decodeFix = function(str) {
    var decoded = B64.decode(str);
    return decoded.slice(0, decoded.lastIndexOf("}") + 1)
};
 * */

function master_slider_getSliders($id)
{
    global $wpdb;
    $sql = "SELECT * FROM `wp_masterslider_sliders` WHERE `ID` = ".$id;
    $results = $wpdb->get_results($sql) or die(mysql_error());
   
    echo $decoded_params = base64_decode ( $results[0]->params );
}

if(isset($_REQUEST["slider_id"]))
{
    master_slider_getSliders($_REQUEST["slider_id"]);
}
?>
admin