SELECT 
  COUNT(*) 
FROM 
  cscart_wishlist_items 
WHERE 
  product_id IN (
    33808, 33809, 33802, 33807, 33806, 33805, 
    33804, 33803, 33801, 33800, 33799, 
    33791
  )

Query time 0.00356

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "355.39"
    },
    "table": {
      "table_name": "cscart_wishlist_items",
      "access_type": "ALL",
      "rows_examined_per_scan": 3521,
      "rows_produced_per_join": 1760,
      "filtered": "50.00",
      "cost_info": {
        "read_cost": "179.34",
        "eval_cost": "176.05",
        "prefix_cost": "355.39",
        "data_read_per_join": "27K"
      },
      "used_columns": [
        "product_id"
      ],
      "attached_condition": "(`cscartdb`.`cscart_wishlist_items`.`product_id` in (33808,33809,33802,33807,33806,33805,33804,33803,33801,33800,33799,33791))"
    }
  }
}