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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450a7a30559ce7f0c26549c557c1691606e3746952386b230e6663c9ac2dfff4' 
  AND token = 'N6Bq4saJUS8rL/71CHJ6iHGa3xwJk9cRkix9n76qArM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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