Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df081531e1130ff921b2aa7bc161d40d71c034c28ab60982ca0426f22e29b15d' 
  AND token = 'oR/BWcFgp9E0v/x0eR9qAhKnP5JkibGGHPjubEeiWMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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