Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157de53ae272f24fdaea6f85c178fcda7c07509bec28c92dfbfe2567eff7f45e' 
  AND token = 'dKH0Gv+shVjmdKSx6/VLQkizzhfISKnc3XKu5AtPgOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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