SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc9a3019ef5d745c1b7b8e5c68c52a1c4716f12bd7764399a7ea37122bf3ff8' 
  AND token = 'S9gOSw2/82nRj1ezAvOVFFogDJLBRD+PaRn7Yph01jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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