Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03adf556c64d79f6884fd211fb1d072a43ac1ed1f1a39d15afb4c2c6c5b4e06b' 
  AND token = 'f7z4dWp2bKWC4aZpQf2MFL/wQXgKDIMvONmCZL/MxLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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