SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc65ec71a08a239483889b421713544e437c314a9537b785dab689ecd3fb70f' 
  AND token = 'DCiO9D5/wg9mHsUgnHE2wHsYx+dwpGzLM9Zn8mFsBOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}