SELECT 
  cscart_abt__ut2_microdata.id, 
  cscart_abt__ut2_microdata.field, 
  cscart_abt__ut2_microdata_description.value 
FROM 
  cscart_abt__ut2_microdata 
  INNER JOIN cscart_abt__ut2_microdata_description ON cscart_abt__ut2_microdata_description.id = cscart_abt__ut2_microdata.id 
  AND cscart_abt__ut2_microdata_description.lang_code = 'de' 
WHERE 
  cscart_abt__ut2_microdata.company_id = 0 
ORDER BY 
  cscart_abt__ut2_microdata.id ASC

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.013361627,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_abt__ut2_microdata",
          "access_type": "index",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["id"],
          "loops": 1,
          "rows": 1,
          "cost": 0.0110178,
          "filtered": 100,
          "attached_condition": "cscart_abt__ut2_microdata.company_id = 0"
        }
      },
      {
        "table": {
          "table_name": "cscart_abt__ut2_microdata_description",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["id", "lang_code"],
          "ref": ["cscart.cscart_abt__ut2_microdata.id", "const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.00171364,
          "filtered": 100,
          "attached_condition": "cscart_abt__ut2_microdata_description.lang_code = 'de'"
        }
      }
    ]
  }
}