SELECT 
  * 
FROM 
  cscart_vd_vendor_optional_questions 
WHERE 
  brand_id = 242

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_vd_vendor_optional_questions",
          "access_type": "ref",
          "possible_keys": ["brand_id"],
          "key": "brand_id",
          "key_length": "4",
          "used_key_parts": ["brand_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}

Result

id brand_id optional_data
242 242 {"model_of_clothing":"21-30 modelos","pieces_per_model":"Menos de 5 por modelo","people_on_brand":"2-5","products_made_mexico":"Sí","production_method":"Todo se produce internamente (in-house)","brand_birth_year":"2011-2015","use_images":"Sí","name_optional":"Steph Orozco","ethnicity_optional":"","newsletter":"Tal vez","newsletter_email":"stephorozcoo@gmail.com","council_participation":"Tal vez","slow_fashion_marketplace":"Tal vez","anything_else_txt":"","fashion_revolution_awareness":"Sí, estoy muy familiarizado\/a.","fashion_revolution_events":"Tal vez, dependiendo del tipo de evento o campaña.","fashion_revolution_importance":"Algo importante, pero no es el único factor.","fashion_revolution_interview":"Sí"}