SELECT 
  cscart_discussion.object_id AS product_id, 
  AVG(
    cscart_discussion_rating.rating_value
  ) AS average_rating, 
  cscart_discussion.type AS discussion_type, 
  cscart_discussion.thread_id AS discussion_thread_id 
FROM 
  cscart_discussion 
  LEFT JOIN cscart_discussion_posts ON cscart_discussion_posts.thread_id = cscart_discussion.thread_id 
  AND cscart_discussion_posts.status = "A" 
  LEFT JOIN cscart_discussion_rating ON cscart_discussion.thread_id = cscart_discussion_rating.thread_id 
  AND cscart_discussion_rating.post_id = cscart_discussion_posts.post_id 
  AND cscart_discussion_rating.rating_value != 0 
WHERE 
  cscart_discussion.object_id IN (
    101022, 101023, 101024, 101025, 101026, 
    101027, 101028, 101029, 101030, 101031, 
    101032, 101033, 101034, 101035, 101107, 
    101108, 101109, 101110, 101111, 101116, 
    101117, 101118, 101119, 101120, 101125, 
    101126, 101127, 101128, 101129, 101509, 
    101510, 101511, 101512, 101513, 101518, 
    101519, 101520, 101521, 101522, 101527, 
    101528, 101529, 101530, 101531, 101547, 
    101548, 101549, 101550, 101551, 101556, 
    101557, 101558, 101559, 101560, 101565, 
    101566, 101567, 101568, 101569, 101794, 
    101795, 101796, 101797, 101798, 101799, 
    101800, 101801, 101802, 101803, 101804, 
    101805, 101806, 101807, 101808, 101809, 
    101810, 101811, 101812, 101813
  ) 
  AND cscart_discussion.object_type = "P" 
GROUP BY 
  cscart_discussion.object_id

Query time 0.00131

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "91.11"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_discussion",
            "access_type": "range",
            "possible_keys": [
              "object_id"
            ],
            "key": "object_id",
            "used_key_parts": [
              "object_id",
              "object_type"
            ],
            "key_length": "6",
            "rows_examined_per_scan": 79,
            "rows_produced_per_join": 79,
            "filtered": "100.00",
            "index_condition": "((`nuie_scalesta_net`.`cscart_discussion`.`object_id` in (101022,101023,101024,101025,101026,101027,101028,101029,101030,101031,101032,101033,101034,101035,101107,101108,101109,101110,101111,101116,101117,101118,101119,101120,101125,101126,101127,101128,101129,101509,101510,101511,101512,101513,101518,101519,101520,101521,101522,101527,101528,101529,101530,101531,101547,101548,101549,101550,101551,101556,101557,101558,101559,101560,101565,101566,101567,101568,101569,101794,101795,101796,101797,101798,101799,101800,101801,101802,101803,101804,101805,101806,101807,101808,101809,101810,101811,101812,101813)) and (`nuie_scalesta_net`.`cscart_discussion`.`object_type` = 'P'))",
            "cost_info": {
              "read_cost": "47.41",
              "eval_cost": "7.90",
              "prefix_cost": "55.31",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "thread_id",
              "object_id",
              "object_type",
              "type"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_discussion_posts",
            "access_type": "ref",
            "possible_keys": [
              "thread_id",
              "thread_id_2"
            ],
            "key": "thread_id",
            "used_key_parts": [
              "thread_id"
            ],
            "key_length": "3",
            "ref": [
              "nuie_scalesta_net.cscart_discussion.thread_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 79,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "19.75",
              "eval_cost": "7.90",
              "prefix_cost": "82.96",
              "data_read_per_join": "34K"
            },
            "used_columns": [
              "post_id",
              "thread_id",
              "status"
            ],
            "attached_condition": "<if>(is_not_null_compl(cscart_discussion_posts), (`nuie_scalesta_net`.`cscart_discussion_posts`.`status` = 'A'), true)"
          }
        },
        {
          "table": {
            "table_name": "cscart_discussion_rating",
            "access_type": "ALL",
            "possible_keys": [
              "PRIMARY",
              "thread_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 79,
            "filtered": "100.00",
            "using_join_buffer": "hash join",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "7.90",
              "prefix_cost": "91.11",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "rating_value",
              "post_id",
              "thread_id"
            ],
            "attached_condition": "<if>(is_not_null_compl(cscart_discussion_rating), ((`nuie_scalesta_net`.`cscart_discussion_rating`.`post_id` = `nuie_scalesta_net`.`cscart_discussion_posts`.`post_id`) and (`nuie_scalesta_net`.`cscart_discussion_rating`.`thread_id` = `nuie_scalesta_net`.`cscart_discussion`.`thread_id`) and (`nuie_scalesta_net`.`cscart_discussion_rating`.`rating_value` <> 0)), true)"
          }
        }
      ]
    }
  }
}