SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35ea012ec830dfbca23ac24a7112ce27e9884c74c78f18a5bcd03c501db595f' 
  AND token = 'VZ4FHUpD7uNLhaAL36yvqWYu39mT/FzXvaKm6YAGBLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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