SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffd9e6d81f4eff618b366b379cb404cd65293da357a5f83fa944df900a3e245' 
  AND token = 'YsKZZgXryOpOxd1l7kzvPRDVv65C/7Lg4hIcCxeg18A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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