SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c6a498d440bb90883d4c2d06827b057fd227a3824d5c6063a84aa79fdc8112' 
  AND token = 'wqKrfi+rmHRrEZUZpv65JUmUnjUvSFcG+ZWlz/uDoXU=' 
  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"
    }
  }
}