SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254111da7b36c1e60351da682f6b7f7ba071a4615fd5fd88dc3b690cf923916e' 
  AND token = 'R0CnhKj2MuWHJrNvYVJ3GcalccgTaGjWdo8g34Kmv4w=' 
  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"
    }
  }
}