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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8539e5bbf68524639246ba2a62e8c6da7117f59e9349021e32d9bae80359ed8' 
  AND token = 'MuGABuoR0ZLwYtdsJ/5v64QncrqOAaU74hLhWMaej6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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