Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c8fb81cb0d3939b093982ea21921bcd36af541da553812e3b9216a3883ac51' 
  AND token = 'jhO8RLnSdHZPFzloOTPdM3Gi5t3w4vrjrrJ3Gwtjqkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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