SELECT 
  cscart_bm_snapping.grid_id as grid_id, 
  cscart_bm_snapping.block_id as block_id, 
  IFNULL(
    dynamic_object_content.content, 
    default_content.content
  ) as content, 
  IFNULL(
    dynamic_object_content.object_id, 
    default_content.object_id
  ) AS object_id, 
  IFNULL(
    dynamic_object_content.object_type, 
    default_content.object_type
  ) AS object_type, 
  cscart_bm_block_statuses.object_ids as object_ids, 
  cscart_bm_snapping.*, 
  cscart_bm_blocks.*, 
  cscart_bm_blocks_descriptions.* 
FROM 
  cscart_bm_snapping 
  LEFT JOIN cscart_bm_blocks ON cscart_bm_blocks.block_id = cscart_bm_snapping.block_id 
  LEFT JOIN cscart_bm_block_statuses ON cscart_bm_snapping.snapping_id = cscart_bm_block_statuses.snapping_id 
  AND cscart_bm_block_statuses.object_type LIKE '' 
  LEFT JOIN cscart_bm_blocks_descriptions ON cscart_bm_blocks.block_id = cscart_bm_blocks_descriptions.block_id 
  LEFT JOIN cscart_bm_blocks_content AS default_content ON cscart_bm_blocks.block_id = default_content.block_id 
  AND cscart_bm_blocks_descriptions.lang_code = default_content.lang_code 
  AND default_content.snapping_id = 0 
  AND default_content.object_id = 0 
  AND default_content.object_type like '' 
  LEFT JOIN cscart_bm_blocks_content AS dynamic_object_content ON cscart_bm_blocks.block_id = dynamic_object_content.block_id 
  AND cscart_bm_blocks_descriptions.lang_code = dynamic_object_content.lang_code 
  AND dynamic_object_content.object_id = 0 
  AND dynamic_object_content.object_type like '' 
WHERE 
  cscart_bm_snapping.grid_id IN (
    384, 385, 386, 387, 388, 389, 390, 391, 
    392, 393, 394, 397, 402, 395, 396, 398, 
    399, 400, 401, 403, 404
  ) 
  AND cscart_bm_blocks_descriptions.lang_code = 'de' 
ORDER BY 
  cscart_bm_snapping.order, 
  cscart_bm_snapping.block_id

Query time 0.00126

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "451.12"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "138.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_bm_snapping",
            "access_type": "range",
            "possible_keys": [
              "grid_id"
            ],
            "key": "grid_id",
            "used_key_parts": [
              "grid_id"
            ],
            "key_length": "4",
            "rows_examined_per_scan": 23,
            "rows_produced_per_join": 23,
            "filtered": "100.00",
            "index_condition": "(`atulecarter_march_setup`.`cscart_bm_snapping`.`grid_id` in (384,385,386,387,388,389,390,391,392,393,394,397,402,395,396,398,399,400,401,403,404))",
            "cost_info": {
              "read_cost": "48.61",
              "eval_cost": "4.60",
              "prefix_cost": "53.21",
              "data_read_per_join": "17K"
            },
            "used_columns": [
              "snapping_id",
              "block_id",
              "grid_id",
              "wrapper",
              "user_class",
              "order",
              "status"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_bm_blocks",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id"
            ],
            "key_length": "4",
            "ref": [
              "atulecarter_march_setup.cscart_bm_snapping.block_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 23,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "23.00",
              "eval_cost": "4.60",
              "prefix_cost": "80.81",
              "data_read_per_join": "5K"
            },
            "used_columns": [
              "block_id",
              "type",
              "properties",
              "company_id",
              "storefront_id"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_bm_blocks_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id",
              "lang_code"
            ],
            "key_length": "10",
            "ref": [
              "atulecarter_march_setup.cscart_bm_snapping.block_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 23,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "23.00",
              "eval_cost": "4.60",
              "prefix_cost": "108.41",
              "data_read_per_join": "4K"
            },
            "used_columns": [
              "block_id",
              "lang_code",
              "name"
            ]
          }
        },
        {
          "table": {
            "table_name": "default_content",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id",
              "snapping_id",
              "lang_code",
              "object_id"
            ],
            "key_length": "18",
            "ref": [
              "atulecarter_march_setup.cscart_bm_snapping.block_id",
              "const",
              "atulecarter_march_setup.cscart_bm_blocks_descriptions.lang_code",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 23,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "23.00",
              "eval_cost": "4.60",
              "prefix_cost": "136.01",
              "data_read_per_join": "5K"
            },
            "used_columns": [
              "snapping_id",
              "object_id",
              "object_type",
              "block_id",
              "lang_code",
              "content"
            ],
            "attached_condition": "<if>(is_not_null_compl(default_content), (`atulecarter_march_setup`.`default_content`.`object_type` like ''), true)"
          }
        },
        {
          "table": {
            "table_name": "cscart_bm_block_statuses",
            "access_type": "ALL",
            "possible_keys": [
              "snapping_id"
            ],
            "rows_examined_per_scan": 2,
            "rows_produced_per_join": 46,
            "filtered": "100.00",
            "using_join_buffer": "Block Nested Loop",
            "cost_info": {
              "read_cost": "2.31",
              "eval_cost": "9.20",
              "prefix_cost": "147.52",
              "data_read_per_join": "5K"
            },
            "used_columns": [
              "snapping_id",
              "object_ids",
              "object_type"
            ],
            "attached_condition": "<if>(is_not_null_compl(cscart_bm_block_statuses), ((`atulecarter_march_setup`.`cscart_bm_snapping`.`snapping_id` = `atulecarter_march_setup`.`cscart_bm_block_statuses`.`snapping_id`) and (`atulecarter_march_setup`.`cscart_bm_block_statuses`.`object_type` like '')), true)"
          }
        },
        {
          "table": {
            "table_name": "dynamic_object_content",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "block_id"
            ],
            "key_length": "4",
            "ref": [
              "atulecarter_march_setup.cscart_bm_snapping.block_id"
            ],
            "rows_examined_per_scan": 3,
            "rows_produced_per_join": 138,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "138.00",
              "eval_cost": "27.60",
              "prefix_cost": "313.12",
              "data_read_per_join": "30K"
            },
            "used_columns": [
              "object_id",
              "object_type",
              "block_id",
              "lang_code",
              "content"
            ],
            "attached_condition": "<if>(is_not_null_compl(dynamic_object_content), ((`atulecarter_march_setup`.`dynamic_object_content`.`object_id` = 0) and (`atulecarter_march_setup`.`dynamic_object_content`.`lang_code` = `atulecarter_march_setup`.`cscart_bm_blocks_descriptions`.`lang_code`) and (`atulecarter_march_setup`.`dynamic_object_content`.`object_type` like '')), true)"
          }
        }
      ]
    }
  }
}

Result

grid_id block_id content object_id object_type object_ids snapping_id wrapper user_class order status type properties company_id storefront_id lang_code name
386 4 0 493 blocks/wrappers/onclick_dropdown.tpl top-my-account 0 A my_account a:1:{s:8:"template";s:21:"blocks/my_account.tpl";} 0 1 de My Account
387 5 0 494 top-logo 0 A template a:2:{s:8:"template";s:32:"blocks/static_templates/logo.tpl";s:11:"enable_link";s:1:"Y";} 0 1 de Logo
389 6 0 496 0 A call_request a:1:{s:8:"template";s:44:"addons/call_requests/blocks/call_request.tpl";} 0 1 de Call Request
392 10 0 499 0 A breadcrumbs a:1:{s:8:"template";s:22:"common/breadcrumbs.tpl";} 0 1 de Breadcrumbs
393 11 0 500 blocks/wrappers/mainbox_general.tpl 0 A main 0 1 de Main Content
391 66 a:1:{s:5:"items";a:3:{s:7:"filling";s:13:"full_tree_cat";s:18:"parent_category_id";s:0:"";s:7:"sort_by";s:8:"position";}} 0 498 0 A categories a:3:{s:8:"template";s:52:"blocks/categories/categories_dropdown_horizontal.tpl";s:30:"dropdown_second_level_elements";s:2:"12";s:29:"dropdown_third_level_elements";s:1:"6";} 0 1 de Main menu
398 68 0 503 blocks/wrappers/footer_general.tpl 0 A template a:1:{s:8:"template";s:44:"blocks/static_templates/my_account_links.tpl";} 0 1 de My account
401 164 a:1:{s:7:"content";s:340:" <ul id="about_cs_cart_links"> <li class="ty-footer-menu__item"><a href="{"pages.view?page_id=1"|fn_url}">Our team</a></li> <li class="ty-footer-menu__item"><a href="{"pages.view?page_id=3"|fn_url}">Privacy policy</a></li> </ul>";} 0 507 blocks/wrappers/footer_general.tpl footer-no-wysiwyg 0 A safe_smarty_block a:1:{s:8:"template";s:28:"blocks/safe_smarty_block.tpl";} 0 1 de About us
398 161 a:1:{s:7:"content";s:261:" <ul id="demo_store_links"> <li class="ty-footer-menu__item"><a href="{"companies.apply_for_vendor"|fn_url}">Apply for a seller account</a></li> <li class="ty-footer-menu__item"><a href="{"pages.view?page_id=15"|fn_url}">Vendor terms & conditions</a></li> </ul>";} 0 504 blocks/wrappers/footer_general.tpl footer-no-wysiwyg 1 A safe_smarty_block a:1:{s:8:"template";s:28:"blocks/safe_smarty_block.tpl";} 0 1 de Become a seller
399 162 a:1:{s:7:"content";s:611:" <ul id="demo_store_links"> <li class="ty-footer-menu__item"><a href="{"pages.view?page_id=2"|fn_url}">About us</a></li> <li class="ty-footer-menu__item"><a href="{"pages.view?page_id=30"|fn_url}">Contact us</a></li> <li class="ty-footer-menu__item"><a href="{"gift_certificates.add"|fn_url}">Gift certificates</a></li> <li class="ty-footer-menu__item"><a href="{"product_features.view_all?filter_id=10"|fn_url}">Our brands</a></li> <li class="ty-footer-menu__item"><a href="{"sitemap.view"|fn_url}">Sitemap</a></li> <li class="ty-footer-menu__item"><a href="{"pages.view?page_id=7"|fn_url}">Blog</a></li> </ul>";} 0 505 blocks/wrappers/footer_general.tpl footer-no-wysiwyg 1 A safe_smarty_block a:1:{s:8:"template";s:28:"blocks/safe_smarty_block.tpl";} 0 1 de Demo Store
388 7 0 495 top-search 2 A template a:1:{s:8:"template";s:34:"blocks/static_templates/search.tpl";} 0 1 de Search
390 8 0 497 top-cart-content 2 A cart_content a:5:{s:8:"template";s:23:"blocks/cart_content.tpl";s:22:"display_bottom_buttons";s:1:"Y";s:20:"display_delete_icons";s:1:"Y";s:19:"products_links_type";s:5:"thumb";s:20:"generate_block_title";s:1:"Y";} 0 1 de Cart content
403 18 0 508 2 A template a:1:{s:8:"template";s:37:"blocks/static_templates/copyright.tpl";} 0 1 de Copyright
404 19 0 509 2 A template a:1:{s:8:"template";s:41:"blocks/static_templates/payment_icons.tpl";} 0 1 de Payment icons
384 65 a:1:{s:4:"text";s:0:"";} 0 490 top-languages 2 A languages a:3:{s:8:"template";s:20:"blocks/languages.tpl";s:6:"format";s:4:"name";s:14:"dropdown_limit";s:1:"0";} 0 1 de Languages
395 67 0 501 2 A template a:1:{s:8:"template";s:56:"addons/newsletters/blocks/static_templates/subscribe.tpl";} 0 1 de Subscribe
396 160 a:1:{s:7:"content";s:683:"<div class="ty-social-link-block"><h3 class="ty-social-link__title">{__("get_social")}</h3> <div class="ty-social-link facebook"> <a href="http://www.facebook.com"><span class="ty-icon ty-icon-facebook"></span>Facebook</a> </div> <div class="ty-social-link instagram"> <a href="https://www.instagram.com"><span class="ty-icon ty-icon-instagram"></span>Instagram</a> </div> <div class="ty-social-link twitter"> <a href="https://twitter.com"><span class="ty-icon ty-icon-twitter"></span>Twitter</a> </div> <div class="ty-social-link youtube"> <a href="https://www.youtube.com/user/cscartvideos"><span class="ty-icon ty-icon-youtube"></span>Youtube</a> </div></div> ";} 0 502 2 A safe_smarty_block a:1:{s:8:"template";s:28:"blocks/safe_smarty_block.tpl";} 0 1 de Social links
400 163 a:1:{s:7:"content";s:705:" <ul id="customer_service_links"> <li class="ty-footer-menu__item"><a href="{"orders.search"|fn_url}">About your order</a></li> {if $addons.wishlist && $addons.wishlist.status == 'A'} <li class="ty-footer-menu__item"><a href="{"wishlist.view"|fn_url}">Wishlist</a></li> {/if} {if $settings.General.enable_compare_products == 'Y'} <li class="ty-footer-menu__item"><a href="{"product_features.compare"|fn_url}">Comparison list</a></li> {/if} </ul>";} 0 506 blocks/wrappers/footer_general.tpl footer-no-wysiwyg 2 A safe_smarty_block a:1:{s:8:"template";s:28:"blocks/safe_smarty_block.tpl";} 0 1 de Customer Service
385 3 a:1:{s:4:"menu";s:1:"1";} 0 492 top-quick-links 3 A menu a:2:{s:8:"template";s:26:"blocks/menu/text_links.tpl";s:18:"show_items_in_line";s:1:"Y";} 0 1 de Quick links
384 186 a:1:{s:4:"text";s:0:"";} 0 491 top-currencies 3 A currencies a:3:{s:8:"template";s:21:"blocks/currencies.tpl";s:6:"format";s:6:"symbol";s:14:"dropdown_limit";s:1:"3";} 0 1 de Currencies