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SELECT 
  lang.value 
FROM 
  tmall_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name = 'ab__emd.placeholders.product_features'

Query time 0.00884

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "lang",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "392",
          "used_key_parts": ["lang_code", "name"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}

Result

value
<b>[some {fvalue_ID} text]</b> — text with a feature value, where ID — is the feature identifier, "some text" — any text (optional) that will be inserted only if product has the value of the corresponding feature<br><b>[some {fname_ID} text]</b> — text with a feature name, where ID — is the feature identifier, "some text" — any text (optional) that will be inserted only if product has the value of the corresponding feature

value

[some {fvalue_ID} text] — text with a feature value, where ID — is the feature identifier, "some text" — any text (optional) that will be inserted only if product has the value of the corresponding feature [some {fname_ID} text] — text with a feature name, where ID — is the feature identifier, "some text" — any text (optional) that will be inserted only if product has the value of the corresponding feature