SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ff86143643e33dd4cae41a1a654fb9bfddea24d2b32a07467309f588a43627' 
  AND token = 'Udg4zZUpAIq0tsK83jmUQ+XyQVl7TvJ22H3bf5yBWZI=' 
  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"
    }
  }
}