SELECT 
  tmall_ab__stickers.pictogram_data, 
  tmall_ab__sticker_descriptions.pictogram_data as description 
FROM 
  tmall_ab__stickers 
  LEFT JOIN tmall_ab__sticker_descriptions ON (
    tmall_ab__stickers.sticker_id = tmall_ab__sticker_descriptions.sticker_id 
    AND tmall_ab__sticker_descriptions.lang_code = 'en'
  ) 
WHERE 
  tmall_ab__stickers.sticker_id = 38

Query time 0.00811

JSON explain

{
  "query_block": {
    "select_id": 1,
    "const_condition": "1",
    "nested_loop": [
      {
        "table": {
          "table_name": "tmall_ab__stickers",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["sticker_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "tmall_ab__sticker_descriptions",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["sticker_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}