Return all data from left table, even if where clause is not attended – Mysql

I have a seller_commissions table, where are related with two other tables: products and sellers (users)

I need to make a painel, where admin can update seller commissions for each product.

Products will be created over time, so I don’t want to insert data in seller_commissions table when this occurs, because I would need to do this multiples times. So, my solution was:
get all products data for user’s update. If seller_commissions are null for specific product, this means the target seller never has your commission updated. In other words, all sellers have commission = 0 in first moment.

I try the following queries:

-- This is the result what I want, but filtering by seller_id, but, unfortannaly this return all products for each seller (I want to specify the seller_id)
select fpp.name as product_name, 
       fsc.seller_id,
       fsc.commission 
from fp_products as fpp 
left join fp_sellers_commissions as fsc 
   on fsc.product_id = fpp.id 
left join fp_users as fpu
   on fpu.id = fsc.seller_id;
   
-- If I use 'where' clause, not all products are returned, because seller_id is none
select fpp.name as product_name, 
       fsc.seller_id,
       fsc.commission 
from fp_products as fpp 
left join fp_sellers_commissions as fsc 
   on fsc.product_id = fpp.id 
left join fp_users as fpu
   on fpu.id = fsc.seller_id
where seller_id = 1;

• result for first query:
  

• result for second query:
  

• expected results:

In first query, is something similiar with what I want. Get all products and seller_commission, but I want this for a specific seller, but when I try to use WHERE clause, I don’t get all products, because seller_id can be null. I try some variations of these queries, but can’t get the expected result :/. Appreciate any help.

to build the schema, use:

-- Create schema
CREATE TABLE `fp_sellers_commissions` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `commission` float NOT NULL DEFAULT '0',
  `product_id` int(11) NOT NULL,
  `seller_id` int(11) NOT NULL,
  PRIMARY KEY (`id`)
);

CREATE TABLE `fp_products` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(64) CHARACTER SET latin1 NOT NULL,
  `createdAt` datetime DEFAULT CURRENT_TIMESTAMP,
  `disabled` tinyint(4) DEFAULT '0',
  PRIMARY KEY (`id`)
);

CREATE TABLE `fp_users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(32) CHARACTER SET latin1 NOT NULL,
  `surname` varchar(32) CHARACTER SET latin1 NOT NULL,
   PRIMARY KEY (`id`)
);

-- Inserting data: 
INSERT INTO `fp_products`
(`id`, `name`, `createdAt`, `disabled`)
VALUES
(1, 'shirt', '00:00:00', 0),
(2, 'shoes', '00:00:00', 0),
(3, 'black shirt', '00:00:00', 0);

INSERT INTO `fp_users`
(`id`,
`name`,
`surname`)
VALUES
(1, 'bilbo', 'aaa'),
(2, 'frodo', 'aaa');

INSERT INTO `fp_sellers_commissions`
(`id`, `commission`, `product_id`, `seller_id`)
VALUES
(1, 100, 1, 1),
(2, 500, 1, 2);

Or you can acess SQL FIDDLE: http://sqlfiddle.com/#!9/d6559f/5