SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2574ba66ec35479a71fb702f993ba530145f56842b4d0ae3d8909d7654fd223e' 
  AND token = 'v2pNNJpwNoXpfzQP7+mf8KvTMXIvLrIUSyWe5GjUqSM=' 
  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"
    }
  }
}