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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101cf6d03fb4fc0b1921c1a27f117a998c56a36f0263795f09982d08e41613d2' 
  AND token = '/V+bWBtmeUB+plcEbZ8+wzjpWmSpMA1HbJ0wOFwj1I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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