SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9405b2874f08f80a545313a574ce6b3269b67f79cb61943c74b7972fd5b284' 
  AND token = 'qFHNeFP/oKlZeZV799Io8YfoBrC+lLG67ZMgNzKyV9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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