Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b34014132110faf14038cfd94ff459ef440c3df09b6ecaa618e8a2ba577bf6' 
  AND token = 't1mttsRVEnGxDqG5mbU4w2uz/0nwXNBdWjp20eIwim4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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