Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9b0bc49e626db034efcd4673261d587634cb55adf1d6e996484c330aa00b69' 
  AND token = 'mrs2yE6a4mhh6kL6JcHxeuRQlIyE64usNtpNkvJ0Syg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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