SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227c108facb2a2b656abc9054158731b391526040cea84b212ddcd097f378b76' 
  AND token = '34+of8/z+8+XBmvaRMtqRw2MeVQvlH0YG5x/RAh5eDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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