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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9baa742e8e55867228a2af3ce562902b140fd42e8274112457bd6899f4ebc2ee' 
  AND token = 'oCCfAakB/OoLG+lL2AxUT+baG9dgD4rkPMEuw2nSrmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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