SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f5703862db0a4f34c478bfcd0a66c8ac20e59291fa765aaf8c4c3634789957' 
  AND token = 'ym5LAYOHskPjK5nYyZcQh2GG+vtWCzIzg8I71nsu7NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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