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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719e963b213def35cba429f8699720d2edf69f70676ed0725b591b7beb02921f' 
  AND token = '4nB3v7nQS8NToT0LHjUH1yObFw8vVfk0B66jh9zNjC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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