SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c925b99b7f33a5c950238e6cd14046f0a3a6ae2ec81effe99ae4a0123f42718d' 
  AND token = 'rJ1d4jtclvKwYnUPKWVVg6J/KH3JGZaLyyX8Zc2+kLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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