Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f862a8e2635f41c0dba5a1aa428a53e05f2244c48c2a019bc3b8c5487ebed947' 
  AND token = 'FRHsf74DCIQyh6VHFUuBw0dsygEhybN2p+1EFyEvz1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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