Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbb883afd9f7dce76123d4f3a58eeadc93e8c57d2fcde5d0be3e140e973c1db' 
  AND token = 'bZRTHWrFV+lUp/MeG5SVb9uUy5NiBX/Ll/iWVrfC9rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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