SELECT 
  search_phrases 
FROM 
  cscart_ab__search_motivation 
WHERE 
  category_id = 0 
  AND company_id = 0 
  AND lang_code = 'en' 
  AND TRIM(search_phrases) > ""

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_ab__search_motivation",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "13",
          "used_key_parts": ["category_id", "company_id", "lang_code"],
          "ref": ["const", "const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}