Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ff35239841a78d44cabe8cf3fb86dd2ac8de92a66fc5cc13e4ad5c0455af2f' 
  AND token = 'UzvvVyDuEExm8J5UL6UOt1y2ygUCqUN+cvrg5W1KeyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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