Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925040e00a174fa93c780cf5026bb3bd4897dc90dc1b255cee925b82a9a36b04' 
  AND token = '4pCQ2rtmvalKlQDec4Br1upkxeGvlI95zatRh/Uwtwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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