Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2a0c715d25623a184711f05fa5a3ba3b48944b8b0c69b96a2b70892ab84bf1' 
  AND token = 'bSkm7w8tWXX0nLzvjDucKzWRv6IqmkMX/Eo7wLNUHd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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