Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8f91b2209de1cf8d8e59fd86d0e7af424e1c6be6eb930f8b626500eb6d7c95' 
  AND token = '5lvGykgKAa+5N9pZB2TVIcaxqDWByjZdrwa0Swq4gs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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