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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a1c690de20e5f1dc98dd6950f0d833e22ee2b2fb2c7ced83d4b8b89d13e7f4' 
  AND token = 'HXPl89UokDYPrY+ykO2++5FsjKiEfe5fK2U8TmhygdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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