SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1737874577905094ae52464f739df6aaa799cf24382facc9d134c28965bed9' 
  AND token = 'f+FsTag9+W3hlYY+L2NR6fLZ8QGjzbSww7wHQC0d5b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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