SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb2e6703787385f2074eee25a8d76d18996446bf17ab51b9d9a73a63f7220aa' 
  AND token = 'LEoU1+vp3QzNNK+Xt/EY7yWpeCnrjRyTcXwZ6f4wUPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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