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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4727ba5b527a2dc4eca186b98e0c450c8edb5650ec7c1ef122c06e6195081d' 
  AND token = 'G6YdD3hQTUd0ZdpAAsXl+4gjVC357tZ5B57GkDXln9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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