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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9adbe8eb5e20b5ee50cd83679f30da73cbf419139841112588a285448e20e4' 
  AND token = 'nd7fEuPWaznCwVE8BO9jb7MzMpXtxqVGIta/oXHuQwU=' 
  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"
    }
  }
}