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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1802af5dbc575b45a1c9a3cee7c806df896dbc52f91fa18fb9d9e099f1b11f2' 
  AND token = 'l6PttQWdnxUFoFb1QWQjMfHwfY7WbmMPQIepYPiBJSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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