Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40e440b8e01aed966ea3bfdbe0b3febf2a1818a20f93318e10de08fbb17bd9f' 
  AND token = 'b2BRe39QyfEHn0HAm0kokB4hmBF4gDxC2/ufwSsr1mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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