Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1aae0c720b834d055511e9c04452f4cbc346fd3141fa2fe18561bdfebf443a1' 
  AND token = 'dMA/8a0Vij89MYJHGHcN2LQz2B4wCjIGvWtb/CzjnMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00228

JSON explain

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