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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5765afe3837e1a923ae786cbd9f44c1230c058e713eb2768c253e5c4c64ec29' 
  AND token = '9gccNg/WbTizyMlLo2ku/VedcSvaLjqgmD8mcJpY2Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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