SELECT 
  company_descriptions.*, 
  companies.*, 
  tconnect_vendor_plan_descriptions.plan, 
  tconnect_seo_names.name as seo_name, 
  tconnect_seo_names.path as seo_path, 
  AVG(
    tconnect_discussion_rating.rating_value
  ) AS average_rating, 
  CONCAT(
    companies.company_id, 
    '_', 
    IF (
      tconnect_discussion_rating.thread_id, 
      tconnect_discussion_rating.thread_id, 
      '0'
    )
  ) AS company_thread_ids 
FROM 
  tconnect_companies AS companies 
  LEFT JOIN tconnect_company_descriptions AS company_descriptions ON company_descriptions.company_id = companies.company_id 
  AND company_descriptions.lang_code = 'en' 
  LEFT JOIN tconnect_vendor_plan_descriptions ON companies.plan_id = tconnect_vendor_plan_descriptions.plan_id 
  AND tconnect_vendor_plan_descriptions.lang_code = 'en' 
  LEFT JOIN tconnect_seo_names ON tconnect_seo_names.object_id = 2 
  AND tconnect_seo_names.type = 'm' 
  AND tconnect_seo_names.dispatch = '' 
  AND tconnect_seo_names.lang_code = 'en' 
  LEFT JOIN tconnect_discussion ON tconnect_discussion.object_id = companies.company_id 
  AND tconnect_discussion.object_type = 'M' 
  LEFT JOIN tconnect_discussion_posts ON tconnect_discussion_posts.thread_id = tconnect_discussion.thread_id 
  AND tconnect_discussion_posts.status = 'A' 
  LEFT JOIN tconnect_discussion_rating ON tconnect_discussion.thread_id = tconnect_discussion_rating.thread_id 
  AND tconnect_discussion_rating.post_id = tconnect_discussion_posts.post_id 
WHERE 
  companies.company_id = 2

Query time 0.00194

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.022730949,
    "const_condition": "1",
    "nested_loop": [
      {
        "table": {
          "table_name": "companies",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "4",
          "used_key_parts": ["company_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "company_descriptions",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "10",
          "used_key_parts": ["company_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "tconnect_vendor_plan_descriptions",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "10",
          "used_key_parts": ["plan_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "tconnect_seo_names",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "dispatch"],
          "key": "PRIMARY",
          "key_length": "206",
          "used_key_parts": ["object_id", "type", "dispatch", "lang_code"],
          "ref": ["const", "const", "const", "const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.002024411,
          "filtered": 100,
          "attached_condition": "trigcond(tconnect_seo_names.`type` = 'm' and tconnect_seo_names.dispatch = '' and tconnect_seo_names.lang_code = 'en')"
        }
      },
      {
        "table": {
          "table_name": "tconnect_discussion",
          "access_type": "const",
          "possible_keys": ["object_id"],
          "key": "object_id",
          "key_length": "6",
          "used_key_parts": ["object_id", "object_type"],
          "ref": ["const", "const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.001933826,
          "filtered": 100,
          "attached_condition": "trigcond(tconnect_discussion.object_type = 'M')"
        }
      },
      {
        "table": {
          "table_name": "tconnect_discussion_posts",
          "access_type": "ref",
          "possible_keys": ["thread_id", "thread_id_2"],
          "key": "thread_id",
          "key_length": "3",
          "used_key_parts": ["thread_id"],
          "ref": ["tconnect.tconnect_discussion.thread_id"],
          "loops": 1,
          "rows": 6,
          "cost": 0.008193756,
          "filtered": 100,
          "attached_condition": "trigcond(tconnect_discussion_posts.`status` = 'A' and trigcond(tconnect_discussion.thread_id is not null))"
        }
      },
      {
        "table": {
          "table_name": "tconnect_discussion_rating",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "thread_id"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["post_id"],
          "ref": ["tconnect.tconnect_discussion_posts.post_id"],
          "loops": 6,
          "rows": 1,
          "cost": 0.010578956,
          "filtered": 100,
          "attached_condition": "trigcond(tconnect_discussion_rating.thread_id = tconnect_discussion.thread_id and trigcond(tconnect_discussion_posts.post_id is not null))"
        }
      }
    ]
  }
}