SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c31cbaf72d296e7b72d970ebd95c1c8d4f027ff28e759bf41f6f93894c66860' 
  AND token = 'oSkPU/WqYCPKtQnMmbBJkkXW4GHjXlrUMBIhgj4+jFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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