Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a801cf761354e47b43c54dbfcba07972db143b4e1a2661f01a38d55a8dc0dd14' 
  AND token = 'pjKjB7H2rNoBRJ7dYTgRHIvxv8fFi6xRU8X6YTMKtGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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