SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7441396ee4c0d95170764f2c4d6230e75527e126252367930a1bd61dbfc0d20d' 
  AND token = 'ma5/blg4ZwmVoKDf6S0nKvYc3+R8Ic+ANHyOuwKGHqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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