Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe34e9e6051fce2539622f028f05867e3cc31fb6a5947508eef8e116854342c5' 
  AND token = '2DjFUbwSes0I5vW2UsDDCN5RjQ9sRoRa7gbDRsWneJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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