SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a903ee6590eea38c2c027897bd65d868dd1c436ce1b6346e4345bfc5b57fb6fa' 
  AND token = 'dPzw6vGXeU2S8VIyKhJZhkgCjUBcnJirJo5fagH9l5o=' 
  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"
    }
  }
}