var settings = require('./settings');
var mysql = require('mysql');
var pool = mysql.createPool({
    host: settings.host,
    database: settings.database,
    user: settings.user,
    password: settings.password
});

module.exports.handler = function (request, context, callback) {
    pool.getConnection(function (error, connection) {
        if (error)
            return callback(error);
        connection.query('select 1', null, function (error, results) {
            callback(null, results);
        });
    });
};

{
    "errorMessage": "2017-07-20T10:04:26.629Z cc46e503-6d32-11e7-8fa9-9902efa96cc1 Task timed out after 6.00 seconds"
}

...
    connection.query('select 1', null, function (error, results) {
        connection.destroy();
        callback(null, results);
    });
...