Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6215e5d916e19d8ddf40bb0daff07daf8aa61750b1c2ada6d07566dd166c74' 
  AND token = 'BKWR183MVQ4HTtsH3VxsDpO7mSvZEFoVqW9APTpK8SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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