SELECT 
  *, 
  cscart_product_tabs.status as status, 
  cscart_product_tabs.block_id as block_id, 
  cscart_product_tabs.company_id as company_id, 
  cscart_product_tabs_descriptions.name as name 
FROM 
  cscart_product_tabs 
  LEFT JOIN cscart_product_tabs_descriptions ON cscart_product_tabs.tab_id = cscart_product_tabs_descriptions.tab_id 
  LEFT JOIN cscart_bm_blocks ON cscart_bm_blocks.block_id = cscart_product_tabs.block_id 
WHERE 
  cscart_product_tabs_descriptions.lang_code = 'fr' 
ORDER BY 
  position

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_product_tabs.position",
        "table": {
          "table_name": "cscart_product_tabs",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 16,
          "filtered": 100
        }
      }
    },
    "table": {
      "table_name": "cscart_product_tabs_descriptions",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["tab_id", "lang_code"],
      "ref": ["multi_vendor.cscart_product_tabs.tab_id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_product_tabs_descriptions.lang_code = 'fr'"
    },
    "table": {
      "table_name": "cscart_bm_blocks",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "4",
      "used_key_parts": ["block_id"],
      "ref": ["multi_vendor.cscart_product_tabs.block_id"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cscart_bm_blocks.block_id = cscart_product_tabs.block_id)"
    }
  }
}