Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a2d0dd253be054f76e5e362f80e518fe8297a7b1911af97a9958747804f023' 
  AND token = 'nDJw/K6mRo4Up9A0JQlkQ2oJ13mbjqb5vXayw/rdxZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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