Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af0c92bd3351d8b8bb64f944b83a70ed2d10bfa21136a784d06f2fe3e53716' 
  AND token = '/0uFMTUOnYsrC5TvnzwL0uKr+dWuhxp2AhgYaRRNaD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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