How to connect to 2 DBs under different users (on SQL only windows authentication)?

Question

SQL Server

I have a Laravel 5.6 PHP 7.2 application running on an IIS 7.5 server. AD authorization works. How can the user execute a query to the MSSQL database with Windows authentication if there is 1 account (for executing queries, something like a service account).
Probably easier on the example of the
user ordinary \ Ivanovvv under him the application
user service \ Petrovaa runs under him the execution of queries to the database
as a normal \ Ivanovvv can connect to the database using the data of the service \ Petrovaa?
Thank you very much in advance!

Answer 1

RMC -> "Run as..."