Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75026e9e225c068daf22fa765b23486018002cae353d3e4fc11ce86fbf4ca13' 
  AND token = 'IRMmzNKznl+Xsc5pPWzfB+5C6jAIEME6UMntaFzk22Y=' 
  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"
    }
  }
}