Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5879e710da7def131594fb4da92af7f98973d2f2330f424da17b933d16aae6e8' 
  AND token = 'ckt+PtfBCn6SZld0D/tLqmqq3v5Ts/RskrfUVyA8AE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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