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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a60002747b45a5c73d7c8eacf6518fde36d5d739bb77b696b84e241f04d6d02' 
  AND token = 'Av96QWh6e2vp7zLzI6zQyGkM5AwJd5Lol04wsrEg6lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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