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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9df02ad8c8820f5c2080e95ea8e9259fe7df8c8a0e4c2a00712a743ff8e5efb' 
  AND token = 'jIOd3wI9BspWixk83BBzme8f3zRUc/5Jb5Eo1S5RCs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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