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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd910f147a5ec297c0834110b6ae9adcd58bf14731953b0cbfa91fee9010608' 
  AND token = 'm4WmtOUMdWT+2Z6hITldqMzb4BnRqWXtjOpT43BCdLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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