Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007a6b4c4cb48f3eae1a3879d7e7e405676ff172e4f81a34a1113078cd034971' 
  AND token = 'Ji7XoCJLBJ+eOF3W2Eu8Jf+uQLScLZaKsiTTDj5SYtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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