SELECT 
  p.product_id, 
  ifnull(
    count(dp.post_id), 
    0
  ) as discussion_amount_posts 
FROM 
  cscart_discussion 
  INNER JOIN cscart_products as p ON (
    cscart_discussion.object_id = p.product_id
  ) 
  INNER JOIN cscart_discussion_posts as dp ON (
    cscart_discussion.thread_id = dp.thread_id 
    AND cscart_discussion.object_type = 'P'
  ) 
WHERE 
  dp.status = 'A' 
  and p.product_id in (
    395983, 395984, 395985, 395986, 395987, 
    395988, 395989, 395990, 395991, 395992, 
    395993, 395994, 395995, 396002, 396003, 
    396004, 396005, 396006, 396007, 396008, 
    396009, 396010, 396011, 396012, 414408, 
    414409, 414410, 414411, 414412, 414413, 
    414436, 414437, 414438, 414439, 414440, 
    414441, 431542, 431543, 431544, 431545, 
    431546, 431547, 431548, 431549, 431550, 
    431551, 431677, 431678, 431679, 431680, 
    431681, 431682, 431683, 431684, 431685, 
    431686, 431561, 431562, 431563, 431564, 
    431565, 431566, 431567, 431568, 431569, 
    431587, 431588, 431589, 431590, 431591, 
    431592, 431593, 431594, 431595, 431596, 
    431597, 431598, 431599, 431600, 431601, 
    431602, 431603, 431604, 431659, 431660, 
    431661, 431662, 431663, 431664, 431665, 
    431666, 431767, 431768, 431769, 431770, 
    431771, 431772, 431773, 431774, 431775
  ) 
GROUP BY 
  p.product_id

Query time 0.00110

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "7.29"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "0.10"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "dp",
            "access_type": "index",
            "possible_keys": [
              "thread_id",
              "thread_id_2"
            ],
            "key": "thread_id_2",
            "used_key_parts": [
              "thread_id",
              "status"
            ],
            "key_length": "6",
            "rows_examined_per_scan": 19,
            "rows_produced_per_join": 1,
            "filtered": "10.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "4.42",
              "eval_cost": "0.38",
              "prefix_cost": "4.80",
              "data_read_per_join": "851"
            },
            "used_columns": [
              "post_id",
              "thread_id",
              "status"
            ],
            "attached_condition": "(`webmarco`.`dp`.`status` = 'A')"
          }
        },
        {
          "table": {
            "table_name": "cscart_discussion",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "object_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "thread_id"
            ],
            "key_length": "3",
            "ref": [
              "webmarco.dp.thread_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "1.90",
              "eval_cost": "0.02",
              "prefix_cost": "7.08",
              "data_read_per_join": "2"
            },
            "used_columns": [
              "thread_id",
              "object_id",
              "object_type"
            ],
            "attached_condition": "((`webmarco`.`cscart_discussion`.`object_id` in (395983,395984,395985,395986,395987,395988,395989,395990,395991,395992,395993,395994,395995,396002,396003,396004,396005,396006,396007,396008,396009,396010,396011,396012,414408,414409,414410,414411,414412,414413,414436,414437,414438,414439,414440,414441,431542,431543,431544,431545,431546,431547,431548,431549,431550,431551,431677,431678,431679,431680,431681,431682,431683,431684,431685,431686,431561,431562,431563,431564,431565,431566,431567,431568,431569,431587,431588,431589,431590,431591,431592,431593,431594,431595,431596,431597,431598,431599,431600,431601,431602,431603,431604,431659,431660,431661,431662,431663,431664,431665,431666,431767,431768,431769,431770,431771,431772,431773,431774,431775)) and (`webmarco`.`cscart_discussion`.`object_type` = 'P'))"
          }
        },
        {
          "table": {
            "table_name": "p",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "age_verification",
              "status",
              "idx_parent_product_id",
              "idx_master_product_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "ref": [
              "webmarco.cscart_discussion.object_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "0.10",
              "eval_cost": "0.02",
              "prefix_cost": "7.19",
              "data_read_per_join": "760"
            },
            "used_columns": [
              "product_id"
            ]
          }
        }
      ]
    }
  }
}