Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a27a1423e9eccc4916adcd2dcec3508e8ae3bf2cc446398e3c90d8da30da9b' 
  AND token = 'xAsFS0ed/argW2vtVaO6i8oiZ15rEoMxZhWof8FHRAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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