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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ae2b91bf0336faea23d7520a0d3ce16f3b64a6073c7a61d11edb4172e1eb47' 
  AND token = '10vtktMPq13jWvzL8cmnIzqGTPm+q2YSfWtGbyzqJw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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