SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677252d4e0465894456d8b83ec3873c4451b7259c5f51a32a674b95241721d8b' 
  AND token = 'WyrbsR0IivRCKMmyCQDL0+oZmnUO1gyBv/lfh6jsKPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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