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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33ef577c515adf35aa56d590c41b7e93ccd962713f2fcdd2efe3b6d68edb200' 
  AND token = 'Zcg1K7tDBkXHGnyvkBs1UmKhsfmz7tOn49228ufbOLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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