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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5d8520c874304f383cb8d0909a7da2aab02d0110962715db2365c2fe17d00e' 
  AND token = 'QlWTp1RzRZ6oAZQtIWp4LCo6kFGmwRWXfOtD+ZFiiOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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