Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8d21716dccbe5bf9b5ed987a9e38dc1d34a2e3ce31a15abec80184ad503ef6' 
  AND token = 'hPqaSyuGTBJxHVyEWx+5G4U9jTOHmjsiRU5bPc2cp6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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