SELECT 
  block_id, 
  link_text, 
  tooltip 
FROM 
  cscart_abt__ut2_block_descriptions 
WHERE 
  block_id IN (212, 206) 
  AND lang_code = 'vn'

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_abt__ut2_block_descriptions",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "10",
          "used_key_parts": ["block_id", "lang_code"],
          "rows": 2,
          "filtered": 100,
          "attached_condition": "cscart_abt__ut2_block_descriptions.block_id in (212,206) and cscart_abt__ut2_block_descriptions.lang_code = 'vn'"
        }
      }
    ]
  }
}