Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731bc9bb45cc00ca06bbda1179ea11973316a3d32dcf8ff97b4f3dddda7e35ba' 
  AND token = 'iyUXSzHJzjh2XgKv8nA4Wg+T3ZGtHFdhPjTLQ9r7j9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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