Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e1d50c3983321512172c7a40407753385c725afa769e318b60884075e366ac' 
  AND token = 'ookMKvRSwWsC6RQ337Q6YfTwYF9JnDWfAxhXtSGqiX8=' 
  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"
    }
  }
}