SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    3077, 3075, 3064, 3061, 3022, 2970, 2929, 
    2881, 2786
  )

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "0.35"
    },
    "table": {
      "table_name": "cscart_warehouses_sum_products_amount",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 1,
      "rows_produced_per_join": 1,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.25",
        "eval_cost": "0.10",
        "prefix_cost": "0.35",
        "data_read_per_join": "16"
      },
      "used_columns": [
        "product_id",
        "amount"
      ],
      "attached_condition": "(`shoptheindependents_com`.`cscart_warehouses_sum_products_amount`.`product_id` in (3077,3075,3064,3061,3022,2970,2929,2881,2786))"
    }
  }
}