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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da42091d894617cce932d43bf995532f49d3b35596152c147d82ece0cc41cb7' 
  AND token = 'lzl8+j2UkY3lN6tKPF9oI0MfKIUbNp9tnxZAzR9XEZA=' 
  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"
    }
  }
}