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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642d7e58cafb7f8313e0cb89bdad499b288c1fd4d48ae7c780db953d72f2bd32' 
  AND token = 'CIq8IUEXMv6FoUAHf+ShhLh6n6jA9wqKTCWEldcogjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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